Interesting...but the stairs and the way the back opens bother me...getting in may not be a problem, but what about getting out...hmmm.
If you have to lift them out anyway, I bet a used infant high chair from a thrift shop or yard sale would fit a Yorkie and without the "," or even a 3rd digit left of the "." in the $. A little acrylic or plastic paint and it'd look 'made for a Yorkie' in no time.